To allow an automatic focusing function to properly operate even when an arbitrary interchangeable lens is mounted.
The present invention relates to allow the automatic focusing function properly operate regardless a mounted interchangeable AF lens part 3 because a focal shift amount Δx' for wobbling as much as an unrecognizable level of defocusing by a photographer is calculated at the interchangeable AF lens part 3 on the basis of the diameter d of an allowable circle of confusion and a ratio a with respect to a depth of focus and an f-stop value FNO of 22, by supplying the diameter d of an allowable circle of confusion and the ratio a with respect to the depth of focus into the interchangeable AF lens part 3 from the main body part 2 of a camera, thus a focusing direction is decided by a control part 28 of the main body part 2 of the camera.
COPYRIGHT: (C)2005,JPO&NCIPI
Hidekazu Sudo
Seiji Sato
Yuuji Terada
Shinji Takemoto
Hitoshi Date
Kazukatsu Yoshikawa
Yasuyuki Tomita
Katsumi Karasawa
キヤノン株式会社
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